Thin illumination device, display device and luminary device

Abstract

The invention relates to a thin illumination device ( 1, 10, 20, 30, 40, 50, 60 ). The invention also relates to a display device and a luminary device comprising such a thin illumination device. The thin illumination device comprises a translucent plate ( 2, 23, 31, 41, 51, 66, 73 ) provided with an array of light-emitting diodes (LEDs) ( 3, 32, 47, 61, 75 ) connected by an electric conducting pattern, and a reflector ( 4, 20, 22, 43, 53, 62, 74 ) arranged on a first side of the plate at a distance from the plate. Such a construction can be made thinner and works more efficiently than a conventional LED thin-film illumination device.

1. A thin illumination device comprising:
 an array of light-emitting diodes interconnected via a electrically conducting pattern; 
 a translucent plate, and 
 a reflector arranged facing a first side of said translucent plate at a predetermined distance from said plate, 
 wherein said array of light emitting diodes is arranged on said first side of said translucent plate to emit light which is substantially directed towards said reflector; 
 said reflector is positioned to reflect light from said light emitting diodes through said translucent plate; 
 said electrically conducting pattern including a translucent electric conducting material; 
 said reflector being substantially parallel to said translucent plate; 
 said translucent plate including a reflecting dot pattern on a second side opposite said first side; 
 said reflecting dot pattern having a relatively high density near said light emitting diodes and a relatively low density remote from said light emitting diodes. 
 
     
     
       2. A thin illumination device according to  claim 1 , wherein the reflector is a diffusing reflector, comprising one or more diffusing elements. 
     
     
       3. A thin illumination device according to  claim 1 , wherein the electric conducting pattern includes a metal wire. 
     
     
       4. A thin illumination device according to  claim 1 , wherein the distance between the reflector and the translucent plate is between 2 and 10 mm. 
     
     
       5. A thin illumination device according to  claim 1 , wherein the array of LEDs comprises blue LEDs and/or UV LEDs, and the reflector comprises a fluorescent material. 
     
     
       6. A thin illumination device according to  claim 1 , wherein at least one fluorescent light tube is arranged between the translucent plate and the reflector. 
     
     
       7. A thin illumination device according to  claim 1 , wherein the translucent plate comprises an optically active front layer. 
     
     
       8. A thin illumination device according to  claim 7 , wherein the optically active front layer is integrated with the translucent plate. 
     
     
       9. A thin illumination device according to  claim 8 , wherein the optically active front layer is positioned at a distance from the translucent plate on said second side of the translucent plate opposite the reflector. 
     
     
       10. A thin illumination device according to  claim 1 , wherein the translucent plate is a flexible polymer film. 
     
     
       11. A thin illumination device comprising:
 an array of light-emitting diodes interconnected through an electrically conducting connector on a first side of a translucent plate, 
 a reflector arranged facing said first side of said translucent plate at a predetermined distance from said plate, 
 an optical stack positioned away from said array of light emitting diodes on an opposite second side of said translucent plate from said reflector; 
 at least one fluorescent light tube arranged between said first side of said translucent plate and said reflector; 
 said array of light emitting diodes being arranged to emit light substantially directed towards said reflector, said reflector positioned to reflect light from said light emitting diodes through said translucent plate; 
 said reflector being substantially parallel to said translucent plate; 
 said translucent plate including a reflecting dot pattern on said second side of said translucent plate and positioned opposite said reflector; 
 said reflecting dot pattern having a relatively high density near said light emitting diodes and a relatively low density remote from said light emitting diodes; 
 said array light emitting diodes including having varying wavelengths, and 
 said reflector including a fluorescent material.